If you're dealing with burning or shooting pain down your leg — into the thigh, calf, or foot — that's the sciatic nerve. The source could be a disc, a compressed nerve root, or the piriformis muscle. Treating it correctly starts with identifying which one. Dr. Nave finds the driver before building the plan.
You might be dealing with sciatica if you have…
Sharp, shooting pain that travels from the low back or glute down into the thigh, calf, or foot — often following a specific line.
A "dead leg" feeling, tingling in the toes, or areas where sensation is reduced — often corresponding to the L4, L5, or S1 nerve root.
Difficulty lifting the foot (foot drop), weakness when rising on tiptoes, or the leg feeling like it could give out under load.
True sciatica is almost always unilateral. Bilateral leg symptoms suggest a different — and often more urgent — source requiring immediate evaluation.
Prolonged hip flexion increases disc pressure and piriformis tension on the sciatic nerve — both classic aggravating positions for sciatica.
Bowel or bladder changes, bilateral leg weakness, or saddle area numbness require emergency evaluation — call 911 or go to the ER immediately.
The sciatic nerve forms from the L4, L5, S1, S2, and S3 nerve roots as they exit the lumbar spine and sacrum. These roots converge into a single nerve — roughly the diameter of your thumb — that runs through the deep gluteal muscles, down the back of the thigh, and branches into the leg and foot.
"Sciatica" describes the symptom of sciatic nerve irritation: shooting pain, numbness, or weakness along the nerve's pathway. It is not itself a diagnosis. The actual diagnosis is whatever is compressing or irritating the nerve — and that distinction is what determines the treatment.
Most people are told they have sciatica and given a stretch sheet or anti-inflammatory. That manages the symptom temporarily but doesn't address the structural reason the nerve is being irritated. The pain comes back — because the source was never found.
See how back pain and sciatica are related →Nerve root origin (L4–S3)
Spinal nerve roots exit between lumbar and sacral vertebrae and converge to form the sciatic nerve at the piriformis level.
Deep gluteal space
The nerve passes beneath (or through) the piriformis muscle — the site of compression in piriformis syndrome.
Posterior thigh
The nerve travels down the back of the leg, giving sensation to the posterior thigh and branching near the knee.
Calf, foot & toes
Terminal branches supply the lower leg, foot, and toes — explaining why disc compression at L5 can produce big toe numbness.
The Key Insight
Where the pain travels tells us approximately which nerve root is involved. Which tests are positive tells us where along the nerve the compression is occurring. Together, they point to the diagnosis — not sciatica, but the specific structural cause of it.
Each lumbar nerve root has a specific sensory territory, motor function, and reflex. Mapping these during the exam localizes the compression to a specific spinal level — which is why the neurological exam matters more than just asking where it hurts.
The L4 nerve root exits between L3 and L4 vertebrae. Compression here — most commonly from an L3-L4 disc herniation — produces symptoms in the anterior thigh, inner knee, and medial shin. L4 controls foot dorsiflexion (pulling the foot up) and the tibialis anterior muscle. Weakness here can cause a scuffing gait or difficulty walking on the heel.
Dermatome
Anterior thigh, inner knee, medial shin
Myotome
Tibialis anterior (foot dorsiflexion)
Reflex
Patellar (knee jerk) — diminished
Common exam findings
Most Likely Disc Level
L3–L4 Herniation
Less common than L4-L5 or L5-S1, but L3-L4 disc herniations do occur — particularly in older adults with degenerative changes at the upper lumbar levels. The anterior thigh pain pattern is a distinguishing feature.
Clinical Note
L4 radiculopathy is sometimes misidentified as a knee problem — especially when the anterior thigh and medial knee pain are prominent. A thorough lumbar exam that includes femoral nerve testing will differentiate lumbar L4 compression from intra-articular knee pathology.
Treatment Approach
Flexion distraction at the L3-L4 segment, extension-biased McKenzie protocol, and tibialis anterior activation exercises to address motor deficit while the disc is decompressed.
L5 is the most commonly compressed nerve root in lumbar disc herniations, typically from the L4-L5 disc. It produces pain and numbness along the outer (lateral) lower leg, the dorsum (top) of the foot, and into the big toe. L5 controls the extensor hallucis longus — the muscle that extends the great toe — making great toe weakness a key clinical sign of L5 involvement. There is no reliable deep tendon reflex for L5, making the sensory and motor exam especially important.
Dermatome
Outer calf, top of foot, 1st–2nd toes
Myotome
Extensor hallucis longus (great toe lift)
Reflex
No reliable reflex — motor/sensory exam critical
Common exam findings
Most Likely Disc Level
L4–L5 Herniation
L4-L5 is the most common site for disc herniation overall. The posterolateral direction of most herniations compresses the L5 root as it exits at that level. Central herniations can occasionally affect both L4 and L5 simultaneously.
Clinical Note
Because there's no reflex to test for L5, the motor exam becomes the primary objective finding. A patient who can barely extend the great toe against resistance has a measurable neurological deficit — and that finding tracks improvement or deterioration over the course of care.
Treatment Approach
Flexion distraction at L4-L5 is the primary intervention. McKenzie extension-bias exercise to centralize the L5 radiculopathy. Neural flossing to restore sciatic nerve glide. Motor tracking of EHL strength to monitor nerve recovery.
S1 is the second most commonly compressed nerve root in lumbar disc herniations, typically from the L5-S1 disc. The pain and numbness pattern runs along the posterior calf, the outer (lateral) ankle, and the bottom or outside of the foot — often described as pain in the heel and outer toes. S1 drives the gastrocnemius (calf) and enables standing on tiptoes. Weakness here is tested by asking the patient to perform repeated single-leg calf raises — a task that is significantly harder than it sounds when S1 motor function is compromised.
Dermatome
Posterior calf, heel, outer foot, 4th–5th toes
Myotome
Gastrocnemius (tiptoe / plantar flexion)
Reflex
Achilles (ankle jerk) — diminished
Common exam findings
Most Likely Disc Level
L5–S1 Herniation
L5-S1 is the lowest and most mobile lumbar segment — and the one subject to the greatest compressive forces. Posterolateral herniations here compress the S1 root in the lateral recess before it exits below S1. This is also the level most associated with the "classic" sciatica presentation patients describe.
Clinical Note
The ankle jerk reflex is one of the most reliable neurological signs in the lumbar exam — easy to test, easy to track. A patient who starts with an absent reflex and regains it over 8 weeks of care is showing objective evidence of nerve root decompression. That's measurable progress, not just patient-reported pain reduction.
Treatment Approach
Flexion distraction targeted at L5-S1. Extension-biased McKenzie protocol. Ankle jerk reflex and calf raise strength tracked as objective outcome measures throughout the plan.
Disc-driven sciatica and piriformis syndrome produce nearly identical symptoms. But the treatment is completely different. Getting this wrong means treating the wrong structure — and wondering why you're not improving.
When a lumbar disc herniates — most commonly at L4-L5 or L5-S1 — the displaced nucleus presses against the nerve root as it exits the spinal canal. This produces true radiculopathy: pain, numbness, and weakness following a dermatomal pattern corresponding to the compressed root level.
Pattern markers:
Primary Treatment
Flexion Distraction + McKenzie Method. Traction-based decompression reduces intradiscal pressure and pulls the nucleus away from the nerve root. Extension-biased exercise centralizes symptoms and supports disc recovery.
The piriformis muscle runs from the sacrum to the femur, and in roughly 15% of people the sciatic nerve passes through it rather than beneath it. When the piriformis becomes hypertonic — from overuse, prolonged sitting, or altered hip mechanics — it can compress the sciatic nerve at the deep gluteal space, producing a sciatica-like pattern with no disc involvement.
Pattern markers:
Primary Treatment
IASTM / Trigger Point Release + Neural Mobilization. Direct soft tissue work on the piriformis during functional hip positions (FAKTR protocol), combined with sciatic nerve flossing to restore nerve glide and reduce intraneural tension.
Why this differentiation matters: Flexion distraction is the right call for a disc herniation but may not address piriformis syndrome at all. And aggressive piriformis stretching can worsen disc-driven sciatica by increasing sciatic nerve tension. The orthopedic exam — not assumption — tells us which protocol to use.
Regardless of source, sciatica recovery follows the same structural logic — decompress, restore nerve mobility, stabilize. The specific tools are different depending on what the exam finds.
Reduce the mechanical load on the sciatic nerve — whether that's disc pressure through flexion distraction, or piriformis compression through direct soft tissue release.
Neural flossing and nerve glide techniques restore normal sliding motion of the sciatic nerve along its pathway, reducing adhesions and intraneural tension from chronic compression.
Core stabilization, hip strengthening, and movement pattern retraining to remove the mechanical loads that caused the compression — so the nerve isn't repeatedly irritated once care ends.
The vast majority of sciatica is manageable with conservative care. But certain findings indicate cauda equina or spinal cord involvement — a surgical emergency that cannot wait.
Go to the ER immediately if you have:
Call us same-day if you have:
An anonymized case study showing the full arc of sciatica care — evaluation findings, source identification, phased treatment, and outcomes at graduation.
Low Back Pain & Sciatica Case Study
L4-L5 disc herniation → L5 radiculopathy → 12-week phased plan → graduation
Sciatica always has an upstream structural cause. Most commonly it traces back to a lumbar disc or piriformis dysfunction that began as back pain. If you want to understand the full picture of how QLC approaches musculoskeletal care, visit our Overland Park chiropractic clinic page or see the full list of conditions we treat.
Your Provider
Dr. Nave is a Doctor of Chiropractic practicing in Overland Park, KS. He focuses on identifying the structural source of pain and building evidence-informed, time-bound care plans — not open-ended adjustments.
View Dr. Nave's background →If you're dealing with sciatica and want a clear plan, the next step is a proper evaluation. At Quality Life Chiropractic in Overland Park, we identify whether your pain is disc-driven, piriformis-driven, or nerve root compression — and build a structured plan specific to that source.
Quality Life Chiropractic · 7102 College Blvd, Overland Park, KS 66210 · (913) 488-3233